protocol v5 duration wire format is overly complex and awkward to implement for clients

Protocol V5 defines the duration type to be on the wire as months, days and nanoseconds. Days and months require a timezone to make sense of the duration and varies depending on from which they are applied for.

Go defines a duration type as nanoseconds in int64 which can represent ~290 years. Java duration does not have way to handle months.

I suggest that before 4.0 is release the duration format is converted to just be represented as nanoseconds.